US11131829B2 - Zoom lens and image pickup apparatus - Google Patents

Zoom lens and image pickup apparatus Download PDF

Info

Publication number
US11131829B2
US11131829B2 US16/019,593 US201816019593A US11131829B2 US 11131829 B2 US11131829 B2 US 11131829B2 US 201816019593 A US201816019593 A US 201816019593A US 11131829 B2 US11131829 B2 US 11131829B2
Authority
US
United States
Prior art keywords
lens
lens unit
refractive power
wide angle
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US16/019,593
Other languages
English (en)
Other versions
US20190004277A1 (en
Inventor
Shunji Iwamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Assigned to CANON KABUSHIKI KAISHA reassignment CANON KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IWAMOTO, SHUNJI
Publication of US20190004277A1 publication Critical patent/US20190004277A1/en
Application granted granted Critical
Publication of US11131829B2 publication Critical patent/US11131829B2/en
Active legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/22—Telecentric objectives or lens systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
    • G02B15/143503—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -+-
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Definitions

  • the present invention relates to a zoom lens and an image pickup apparatus and is advantageously applicable to an image pickup optical system for use in an image pickup apparatus such as a digital camera, a video camera, a TV camera, or a surveillance camera.
  • an image pickup optical system for use in an image pickup apparatus be a small zoom lens having a short total length of the zoom lens and having high optical performance over the entire zoom range. It is also demanded that a zoom lens have good telecentricity at the image side because off-axial rays incident on an image pickup element at large angles cause shading (color shading) and a deficiency in the light amount of peripheral rays.
  • Japanese Patent Application Laid-Open No. 2011-059293 discloses a zoom lens aiming to shorten the total length of the zoom lens and offer good telecentricity by using a lens unit having a negative refractive power that is disposed closest to the image side and includes a positive lens closest to the image side.
  • a zoom lens for use in an image pickup apparatus is to, for example, have high optical performance over the entire zoom range, have good telecentricity at the image side, and also, have a small size with a short total length of the zoom lens.
  • good telecentricity at the image side is not obtained, principal rays are incident on a peripheral portion of an image pickup element at such a large angle that problems occur such as shading and a deficiency in the light amount of peripheral rays to degrade the image quality of a taken image.
  • the zoom lens according to an aspect of the present invention comprising a plurality of lens units, intervals between adjacent ones of the lens units being changed during zooming, in which the plurality of lens units consist of a front group including at least one lens unit and a rear group disposed at an image side of the front group and including a plurality of lens units, an interval between the front group and the rear group on an optical axis is the longest among all the intervals between the adjacent ones of the lens units at a wide angle end, the front group has a negative refractive power at the wide angle end, the rear group has a positive refractive power at the wide angle end, the rear group comprises a lens unit LN having a negative refractive power and disposed closest to the image side, the lens unit LN comprises a negative lens LNN disposed closest to an object side among lenses included in the lens unit LN and a positive lens LNP disposed closest to the image side among the lenses included in the lens unit LN, and the following conditional expressions are satisfied: ⁇ 2.5 ⁇ fn/fw
  • FIG. 1 is a lens sectional diagram of the zoom lens of Example 1 at a wide angle end.
  • FIG. 2A is an aberration diagram of the zoom lens of Example 1 focused at infinity at the wide angle end.
  • FIG. 2B is an aberration diagram of the zoom lens of Example 1 focused at infinity at the intermediate zoom position.
  • FIG. 2C is an aberration diagram of the zoom lens of Example 1 focused at infinity at the telephoto end.
  • FIG. 3 is a lens sectional diagram of a zoom lens of Example 2 at the wide angle end.
  • FIG. 4A is an aberration diagram of the zoom lens of Example 2 focused at infinity at the wide angle end.
  • FIG. 4B is an aberration diagram of the zoom lens of Example 2 focused at infinity at the intermediate zoom position.
  • FIG. 4C is an aberration diagram of the zoom lens of Example 2 focused at infinity at the telephoto end.
  • FIG. 5 is a lens sectional diagram of a zoom lens of Example 3 at the wide angle end.
  • FIG. 6A is an aberration diagram of the zoom lens of Example 3 focused at infinity at the wide angle end.
  • FIG. 6B is an aberration diagram of the zoom lens of Example 3 focused at infinity at the intermediate zoom position.
  • FIG. 6C is an aberration diagram of the zoom lens of Example 3 focused at infinity at the telephoto end.
  • FIG. 7 is a lens sectional diagram of a zoom lens of Example 4 at the wide angle end.
  • FIG. 8A is an aberration diagram of the zoom lens of Example 4 focused at infinity at the wide angle end.
  • FIG. 8B is an aberration diagram of the zoom lens of Example 4 focused at infinity at the intermediate zoom position.
  • FIG. 8C is an aberration diagram of the zoom lens of Example 4 focused at infinity at the telephoto end.
  • FIG. 9 is a lens sectional diagram of a zoom lens of Example 5 at the wide angle end.
  • FIG. 10A is an aberration diagram of the zoom lens of Example 5 focused at infinity at the wide angle end.
  • FIG. 10B is an aberration diagram of the zoom lens of Example 5 focused at infinity at the intermediate zoom position.
  • FIG. 10C is an aberration diagram of the zoom lens of Example 5 focused at infinity at the telephoto end.
  • FIG. 11 is a lens sectional diagram of a zoom lens of Example 6 at the wide angle end.
  • FIG. 12A is an aberration diagram of the zoom lens of Example 6 focused at infinity at the wide angle end.
  • FIG. 12B is an aberration diagram of the zoom lens of Example 6 focused at infinity at the intermediate zoom position.
  • FIG. 12C is an aberration diagram of the zoom lens of Example 6 focused at infinity at the telephoto end.
  • FIG. 13 is a lens sectional diagram of a zoom lens of Example 7 at the wide angle end.
  • FIG. 14A is an aberration diagram of the zoom lens of Example 7 focused at infinity at the wide angle end.
  • FIG. 14B is an aberration diagram of the zoom lens of Example 7 focused at infinity at the intermediate zoom position.
  • FIG. 14C is an aberration diagram of the zoom lens of Example 7 focused at infinity at the telephoto end.
  • FIG. 15 is a diagram of optical paths through a lens system in a part of the zoom lens of Example 1.
  • FIG. 16 is a schematic diagram of a main part of an image pickup apparatus according to an embodiment.
  • a zoom lens of each Example includes a plurality of lens units in which intervals between adjacent ones of the lens units are changed during zooming.
  • the plurality of lens units consist of a front group including at least one lens unit and a rear group which is disposed at the image side of the front group and includes a plurality of lens units. Over the entire zoom range, the interval between the front group and the rear group on the optical axis is the longest among all the distances between adjacent ones of the lens units.
  • the front group has a negative refractive power at the wide angle end
  • the rear group has a positive refractive power at the wide angle end.
  • FIG. 1 is a lens sectional diagram of the zoom lens of Example 1 at the wide angle end (a short focal length end).
  • FIGS. 2A, 2B, and 2C are longitudinal aberration diagrams of the zoom lens of Example 1 focused at infinity at the wide angle end, at an intermediate zoom position, and at the telephoto end (a long focal length end), respectively.
  • the zoom lens of Example 1 has a zoom ratio of 2.94 and an F-number of 3.50 to 5.82.
  • FIG. 3 is a lens sectional diagram of the zoom lens of Example 2 at the wide angle end.
  • FIGS. 4A, 4B, and 4C are longitudinal aberration diagrams of the zoom lens of Example 2 focused at infinity at the wide angle end, at the intermediate zoom position, and at the telephoto end, respectively.
  • the zoom lens of Example 2 has a zoom ratio of 2.80 and an F-number of 3.64 to 6.50.
  • FIG. 5 is a lens sectional diagram of the zoom lens of Example 3 at the wide angle end.
  • FIGS. 6A, 6B, and 6C are longitudinal aberration diagrams of the zoom lens of Example 3 focused at infinity at the wide angle end, at the intermediate zoom position, and at the telephoto end, respectively.
  • the zoom lens of Example 3 has a zoom ratio of 7.08 and an F-number of 3.59 to 5.88.
  • FIG. 7 is a lens sectional diagram of the zoom lens of Example 4 at the wide angle end.
  • FIGS. 8A, 8B, and 8C are longitudinal aberration diagrams of the zoom lens of Example 4 focused at infinity at the wide angle end, at the intermediate zoom position, and at the telephoto end, respectively.
  • the zoom lens of Example 4 has a zoom ratio of 7.07 and an F-number of 3.40 to 5.88.
  • FIG. 9 is a lens sectional diagram of the zoom lens of Example 5 at the wide angle end.
  • FIGS. 10A, 10B, and 10C are longitudinal aberration diagrams of the zoom lens of Example 5 focused at infinity at the wide angle end, at the intermediate zoom position, and at the telephoto end, respectively.
  • the zoom lens of Example 5 has a zoom ratio of 10.48 and an F-number of 3.73 to 6.50.
  • FIG. 11 is a lens sectional diagram of the zoom lens of Example 6 at the wide angle end.
  • FIGS. 12A, 12B, and 12C are longitudinal aberration diagrams of the zoom lens of Example 6 focused at infinity at the wide angle end, at the intermediate zoom position, and at the telephoto end, respectively.
  • the zoom lens of Example 6 has a zoom ratio of 10.48 and an F-number of 3.52 to 6.45.
  • FIG. 13 is a lens sectional diagram of the zoom lens of Example 7 at the wide angle end.
  • FIGS. 14A, 14B, and 14C are longitudinal aberration diagrams of the zoom lens of Example 7 focused at infinity at the wide angle end, at the intermediate zoom position, and at the telephoto end, respectively.
  • the zoom lens of Example 7 has a zoom ratio of 8.45 and an F-number of 3.68 to 6.50.
  • FIG. 15 is a diagram of optical paths through a lens system in a part of the zoom lens of Example 1.
  • FIG. 16 is a schematic diagram of a main part of an image pickup apparatus according to an embodiment.
  • the zoom lens of each Example is an image pickup optical system (or an optical system) for use in an image pickup apparatus such as a video camera or a digital camera.
  • the left hand is the object side (or the front side)
  • the right hand is the image side (or the rear side).
  • the zoom lens of each Example may be used for a projector, in which case the left hand is the screen side, and the right hand is the projected image side.
  • L 0 represents a zoom lens.
  • the front group LF includes at least one lens unit.
  • the rear group LR includes a plurality of lens units.
  • the order of a lens unit counted from the object side is represented by i.
  • the i-th lens unit is represented by Li.
  • An aperture stop (maximum aperture F-number stop) is represented by SP.
  • An image plane is represented by IMG.
  • the image plane corresponds to the imaging plane of a solid-state image pickup element (a photo-electric conversion element) such as a CCD or CMOS sensor when the zoom lens is used as an imaging optical system for a video camera or a digital still camera.
  • the arrows indicate the directions in which the lens units move during zooming from the wide angle end to the telephoto end.
  • Lpf represents a focus lens unit.
  • the arrow indicated by FOCUS indicates the direction in which a lens unit moves during focusing from infinity to close distance, and Lpi denotes a lens system for image blur correction.
  • the wide angle end and the telephoto end refer to zoom positions which are available ends of the zoom range in which the lens units for varying magnification can move on an optical axis mechanically.
  • the solid line d and the broken line g represent d-line (587.6 nm) and g-line (435.8 nm), respectively.
  • the solid line S represents the sagittal direction of d-line
  • the broken line M represents the meridional direction of d-line.
  • the part showing distortion indicates distortion for d-line.
  • the broken line represents lateral chromatic aberration for d-line.
  • “Fno” represents an F-number
  • “co” denotes a half angle of view (°).
  • an arrangement in which a lens unit having a negative refractive power is disposed on the image side is what is called telephoto-type power (refractive power) arrangement, and such an arrangement makes it easy to shorten the total length of the zoom lens.
  • telephoto-type power reffractive power
  • a lens unit having a negative refractive power is disposed closest to the image side, off-axial rays are incident on the image plane at large angles due to the divergence effect of the lens unit having a negative refractive power, making it difficult to obtain sufficient telecentricity.
  • Disposing a positive lens on the image side is effective in obtaining sufficient telecentricity and makes it easy to obtain telecentricity due to convergence effect of the positive lens.
  • a lens unit LN having a negative refractive power is disposed closest to the image side, and the lens unit LN has a negative lens LNN disposed closest to the object side and a positive lens LNP disposed closest to the image side. Further, the thickness of the lens unit LN closest to the image side is sufficiently increased as illustrated in FIG. 15 , so that rays diverged by the negative lens LNN can be converged by the positive lens LNP to obtain telecentricity effectively.
  • the zoom lens of each Example consists of a front group LF including at least one lens unit and a rear group LR which is disposed at the image side of the front group LF and includes a plurality of lens units.
  • the interval between the front group LF and the rear group LR on the optical axis is the longest among all the air intervals between adjacent ones of the lens units at the wide angle end, and intervals of the adjacent ones of the lens units change during zooming.
  • the front group LF has a negative refractive power at the wide angle end
  • the rear group LR has a positive refractive power at the wide angle end.
  • the rear group LR includes the lens unit LN having a negative refractive power closest to the image side.
  • the lens unit LN includes a negative lens LNN closest to the object side among the lenses included in the lens unit LN and a positive lens LNP closest to the image side among the lenses included in the lens unit LN.
  • the zoom lens satisfies the following conditional expressions: ⁇ 2.5 ⁇ fn/fw ⁇ 0.6, and (1) 0.9 ⁇ D/skw ⁇ 3.0 (2) where fn represents the focal length of the lens unit LN, fw represents the focal length of the zoom lens at the wide angle end, D represents the distance on the optical axis from a lens surface closest to the object side in the lens unit LN to a lens surface closest to the image side in the lens unit LN, and skw represents the back focal length at the wide angle end.
  • Conditional Expression (1) defines the ratio of the focal length of the lens unit LN to the focal length of the zoom lens at the wide angle end. If the ratio falls below the lower limit value of Conditional Expression (1) such that the negative refractive power of the lens unit LN is weak (or small in absolute value), increasing the total length of the zoom lens, it is not preferable. If the ratio exceeds the upper limit value of Conditional Expression (1), the lens unit LN generates various aberrations so much that it is difficult to correct the various aberrations, in particular, variation in coma associated with zooming becomes large, it is not preferable.
  • Conditional Expression (2) defines the relation between the thickness of the lens unit LN and the back focus. If the ratio exceeds the upper limit value in Conditional Expression (2) such that the lens unit LN is too thick, increasing the size of the lens unit LN, it is not preferable. If the ratio falls below the lower limit value in Conditional Expression (2), the lens unit LN is too thin, making it difficult to obtain sufficient telecentricity, it is not preferable.
  • Conditional Expressions (1) and (2) are set as follows: ⁇ 1.68 ⁇ fn/fw ⁇ 0.95, and (1a) 0.91 ⁇ D/skw ⁇ 1.66. (2a)
  • the zoom lens satisfies at least one of the following conditional expressions: ⁇ 1.50 ⁇ ffw/frw ⁇ 0.65, (3) ⁇ 5.0 ⁇ ( R 1 LNN+R 2 LNN )/( R 1 LNN ⁇ R 2 LNN ) ⁇ 0.8, (4) 2.243 ⁇ NdLNN+ ⁇ dLNN ⁇ 0.01143 ⁇ 2.410, and (5) 1.1 ⁇ LNt/ ⁇ LNw ⁇ 1.9 (6)
  • ffw represents the focal length of the front group LF at the wide angle end
  • frw represents the focal length of the rear group LR at the wide angle end
  • R 1 LNN represents the curvature radius of the lens surface at the object side of the negative lens LNN
  • R 2 LNN represents the curvature radius of the lens surface at the image side of the negative lens LNN
  • NdLNN represents the refractive index of the material of the negative lens LNN
  • ⁇ dLNN represents the Abbe number of the material of the negative lens LNN
  • ⁇ LNw represents the imaging lateral magnification of the lens unit LN at the wide angle end
  • ⁇ LNt represents the imaging lateral magnification of the lens unit LN at the telephoto end.
  • Conditional Expression (3) defines the ratio of the focal length of the front group LF to the focal length of the rear group LR. If the ratio exceeds the upper limit value of Conditional Expression (3) such that the focal length of the rear group LR is long, making it difficult to obtain sufficiently long back focus at the wide angle end, it is not preferable. If the ratio falls below the lower limit value of Conditional Expression (3) such that the negative focal length of the front group LF is large in absolute value, a moving amount of the front group LF becomes large during zooming from the wide angle end to the telephoto end and therefore makes it difficult to reduce the size of the zoom lens, it is not preferable.
  • Conditional Expression (4) defines the lens shape of the negative lens LNN. As illustrated in FIG. 15 , axial rays incident on the negative lens LNN become convergent light. Thus, when the negative lens LNN has a strong concave surface facing toward the object side, a generation amount of spherical aberration is suppressed, making it easy to correct the spherical aberration. If the value exceeds the upper limit value in Conditional Expression (4) such that the curvature radius of the lens surface at the image side of the negative lens LNN is large in absolute value, it becomes difficult to give sufficient refractive power to the negative lens LNN and therefore makes the effect of reducing the total length of the zoom lens insufficient, it is not preferable. If the value falls below the lower limit value in Conditional Expression (4) such that the curvature radius of the lens surface at the image side of the negative lens LNN is small in absolute value, the spherical aberration becomes over-corrected, it is not preferable.
  • Conditional Expression (5) defines the relation between the refractive index and the Abbe number of the material of the negative lens LNN. If the value exceeds the upper limit value in Conditional Expression (5) such that the refractive index or the Abbe number is large, the number of appropriate optical materials decreases, it is not preferable. If the value falls below the lower limit value in Conditional Expression (5) such that the refractive index is small, correction of the Petzval sum becomes insufficient and the field curvature becomes over-corrected, it is not preferable. If the value falls below the lower limit value in Conditional Expression (5) such that the Abbe number is small, the negative lens LNN generates chromatic aberration so much that it is difficult to correct the chromatic aberration over the entire zoom range, it is not preferable.
  • Conditional Expression (6) defines the zooming share of the lens unit LN. If the ratio exceeds the upper limit value in Conditional Expression (6) such that the zooming share of the lens unit LN is large, a moving amount of the lens unit LN during zooming becomes large and therefore increases the size of the zoom lens, it is not preferable. If the ratio falls below the lower limit value in Conditional Expression (6) such that the zooming share of the lens unit LN is small, it becomes difficult to obtain a high zoom ratio, it is not preferable.
  • Conditional Expressions (3) to (6) are set as follows: ⁇ 1.10 ⁇ ffw/frw ⁇ 0.65, (3a) ⁇ 4.0 ⁇ ( R 1 LNN+R 2 LNN )/( R 1 LNN ⁇ R 2 LNN ) ⁇ 1.2, (4a) 2.258 ⁇ NdLNN+ ⁇ dLNN ⁇ 0.01143 ⁇ 2.340, and (5a) 1.20 ⁇ LNt/ ⁇ LNw ⁇ 1.72. (6a)
  • a lens unit Lpf having a positive refractive power is disposed at the object side of the lens unit LN adjacently to the lens unit LN.
  • the lens unit Lpf moves during focusing. It is preferred that focusing is performed by the movement of the lens unit Lpf, the moving amount of the lens unit Lpf during focusing can be shortened by the effect of the lens unit LN having a negative refractive power, so that the size reduction of the zoom lens is facilitated. Further, the field curvature can be easily corrected because the lens unit Lpf having a positive refractive power and the lens unit LN having a negative refractive power can reduce the Petzval sum.
  • the zoom lens of each Example includes a lens system Lpi at the object side of the lens unit Lpf.
  • the lens system Lpi moves in a direction having a component perpendicular to the optical axis. Even a little vibration such as hand shake causes image blur and degrades image quality.
  • the zoom lens preferably has what is called image stabilizing function to correct image blur upon a vibration such as hand shake.
  • Image blur correction can reduce image blur by driving part of the lens system, namely the lens system Lpi, in a direction having a component perpendicular to the optical axis.
  • the zoom lens includes the lens system Lpi having a positive refractive power at the object side of the lens unit LN, and image blur is reduced by driving the lens system Lpi in a direction having a component perpendicular to the optical axis.
  • the zoom lens of each Example has the lens unit LN having a strong negative refractive power arranged closest to the image side.
  • the refractive power arrangement of the lens units is made be appropriate.
  • the lens configuration of each Example is described.
  • the front group LF consists of a first lens unit L 1 having a negative refractive power.
  • the rear group LR consists of a second lens unit L 2 having a positive refractive power, a third lens unit L 3 having a positive refractive power, and a fourth lens unit L 4 having a negative refractive power arranged in order from the object side to the image side.
  • Example 2 has the same zooming type, such as the number of lens units and the refractive powers of each lens units, as Example 1.
  • the front group LF consists of a first lens unit L 1 having a positive refractive power and a second lens unit L 2 having a negative refractive power arranged in order from the object side to the image side.
  • the rear group LR consists of a third lens unit L 3 having a positive refractive power, a fourth lens unit L 4 having a positive refractive power, and a fifth lens unit L 5 having a negative refractive power arranged in order from the object side to the image side.
  • Example 4 has the same zooming type as Example 3.
  • the front group LF consists of a first lens unit L 1 having a positive refractive power and a second lens unit L 2 having a negative refractive power arranged in order from the object side to the image side.
  • the rear group LR consists of a third lens unit L 3 having a positive refractive power, a fourth lens unit L 4 having a positive refractive power, a fifth lens unit L 5 having a positive refractive power, and a sixth lens unit L 6 having a negative refractive power arranged in order from the object side to the image side.
  • Example 6 has the same zooming type as Example 3.
  • the front group LF consists of a first lens unit L 1 having a positive refractive power and a second lens unit L 2 having a negative refractive power arranged in order from the object side to the image side.
  • the rear group LR consists of a third lens unit L 3 having a positive refractive power, a fourth lens unit L 4 having a positive refractive power, a fifth lens unit L 5 having a positive refractive power, a sixth lens unit L 6 having a positive refractive power, and a seventh lens unit L 7 having a negative refractive power arranged in order from the object side to the image side.
  • FIG. 16 a camera body 20 is illustrated.
  • An image pickup system 21 is formed by the zoom lens described in any one of Examples 1 to 7.
  • a solid-state image pickup element (a photo-electric conversion element) 22 such as a CCD or CMOS sensor is incorporated in the camera body 20 and receives light of a subject image formed by the image pickup optical system 21 .
  • Memory 23 stores information corresponding to the subject image photo-electrically converted by the solid-state image pickup element 22 .
  • a finder 24 is configured with a liquid crystal display panel or the like and is used for observing the subject image formed on the solid-state image pickup element 22 .
  • the zoom lens of each Example is similarly applicable to a single-lens reflex camera with a quick-return mirror or a mirror-less single-lens reflex camera without the quick-return mirror.
  • Numerical Examples 1 to 7 corresponding to the respective Examples 1 to 7 are described as follows.
  • i indicates the order of a surface counted from the object side.
  • ri represents the curvature radius of the i-th lens surface from the object side.
  • di represents the lens thickness and air interval between the i-th surface and the (i+1)-th surface from the object side.
  • ndi and vdi represent the refractive index and the Abbe number, respectively, of the material of a lens between the i-th surface and the (i+1)-th surface from the object side.
  • BF represents a back focus.
  • an aspherical shape is expressed as follows.
  • each lens unit data provide the focal length of each lens unit.
  • Example 1 ⁇ 1.510 1.118 ⁇ 1.017 ⁇ 1.967 2.288 1.326
  • Example 2 ⁇ 1.333 1.164 ⁇ 0.820 ⁇ 1.277 2.322 1.298
  • Example 3 ⁇ 1.601 1.148 ⁇ 0.841 ⁇ 2.053 2.331 1.499
  • Example 4 ⁇ 1.097 1.459 ⁇ 0.869 ⁇ 2.011 2.336 1.615
  • Example 5 ⁇ 1.260 1.580 ⁇ 0.723 ⁇ 2.152 2.262 1.574
  • Example 6 ⁇ 1.568 1.528 ⁇ 0.830 ⁇ 3.783 2.294 1.588
  • Example 7 ⁇ 1.005 0.911 ⁇ 0.855 ⁇ 2.000 2.259 1.635

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)
  • Adjustment Of Camera Lenses (AREA)
US16/019,593 2017-06-28 2018-06-27 Zoom lens and image pickup apparatus Active 2038-09-04 US11131829B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JPJP2017-126009 2017-06-28
JP2017126009A JP7023625B2 (ja) 2017-06-28 2017-06-28 ズームレンズ及びそれを有する撮像装置
JP2017-126009 2017-06-28

Publications (2)

Publication Number Publication Date
US20190004277A1 US20190004277A1 (en) 2019-01-03
US11131829B2 true US11131829B2 (en) 2021-09-28

Family

ID=64738707

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/019,593 Active 2038-09-04 US11131829B2 (en) 2017-06-28 2018-06-27 Zoom lens and image pickup apparatus

Country Status (3)

Country Link
US (1) US11131829B2 (enrdf_load_stackoverflow)
JP (1) JP7023625B2 (enrdf_load_stackoverflow)
CN (1) CN109143557B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12366726B2 (en) 2021-07-06 2025-07-22 Canon Kabushiki Kaisha Optical system and image pickup apparatus having the same
US12405456B2 (en) 2022-08-10 2025-09-02 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018116415B4 (de) 2017-07-10 2020-08-06 Canon Kabushiki Kaisha Zoomobjektiv und bildaufnahmegerät
JP7289711B2 (ja) 2019-04-25 2023-06-12 キヤノン株式会社 光学系及びそれを有する撮像装置
CN112612127B (zh) * 2019-09-18 2022-05-24 Oppo广东移动通信有限公司 变焦镜头、成像模组和电子设备
KR20210121543A (ko) * 2020-03-30 2021-10-08 엘지이노텍 주식회사 광학계 및 이를 포함하는 카메라 모듈
JP2021173860A (ja) * 2020-04-24 2021-11-01 ビクター ハッセルブラッド アクチボラーグVictor Hasselblad Ab レンズ系及び撮像装置
JP2021189381A (ja) * 2020-06-03 2021-12-13 エスゼット ディージェイアイ テクノロジー カンパニー リミテッドSz Dji Technology Co., Ltd レンズ系、撮像装置、及び移動体
JP7483513B2 (ja) 2020-06-08 2024-05-15 キヤノン株式会社 ズームレンズおよび撮像装置

Citations (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5576891A (en) 1993-04-22 1996-11-19 Ricoh Company, Ltd. Zoom lens using a first lens group having a positive focal length and a second lens group having a negative focal length
JPH11109233A (ja) 1997-09-30 1999-04-23 Minolta Co Ltd ズームレンズ系
CN1517742A (zh) 2003-01-24 2004-08-04 株式会社尼康 变焦透镜系统
US20050122596A1 (en) 2003-11-14 2005-06-09 Kazuyasu Ohashi Zoom lens, lens unit, camera and portable information terminal device
CN1755412A (zh) 2004-09-27 2006-04-05 富士能株式会社 变焦距光学系统
JP2006337648A (ja) 2005-06-01 2006-12-14 Canon Inc ズームレンズ
JP2007148056A (ja) 2005-11-29 2007-06-14 Canon Inc ズーム光学系
CN101487925A (zh) 2008-01-16 2009-07-22 佳能株式会社 变焦透镜和包括该变焦透镜的图像拾取设备
JP2010039426A (ja) 2008-08-08 2010-02-18 Hoya Corp 高変倍ズームレンズ系
CN101770067A (zh) 2008-12-26 2010-07-07 佳能株式会社 光学系统和包含光学系统的光学装置
JP2011059293A (ja) 2009-09-09 2011-03-24 Sigma Corp 変倍結像光学系
US20110090574A1 (en) 2009-09-09 2011-04-21 Nikon Corporation Wide-angle lens, imaging optical apparatus and digital equipment
JP2012150248A (ja) 2011-01-19 2012-08-09 Nikon Corp 変倍光学系、光学機器、及び、変倍光学系の製造方法
JP2012212087A (ja) 2011-03-31 2012-11-01 Nikon Corp ズームレンズ、光学装置、ズームレンズの製造方法
CN103529541A (zh) 2012-06-29 2014-01-22 佳能株式会社 变焦透镜和图像拾取装置
US20140055659A1 (en) 2012-08-22 2014-02-27 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus
US20140085513A1 (en) * 2012-09-21 2014-03-27 Canon Kabushiki Kaisha Zoom lens, image-pickup apparatus having the same, and image projection apparatus having the same
US20140125858A1 (en) 2012-11-06 2014-05-08 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus including same
US20140307152A1 (en) 2013-04-15 2014-10-16 Canon Kabushiki Kaisha Zoom lens and image pickup device including the same
JP2015028530A (ja) 2013-07-30 2015-02-12 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
US20150077594A1 (en) 2013-08-05 2015-03-19 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus including the same
JP2015138122A (ja) 2014-01-22 2015-07-30 キヤノン株式会社 光学系及びそれを有する撮像装置
EP2955558A1 (en) 2014-06-13 2015-12-16 Ricoh Company, Ltd. Optical objective of the retrofocus type
JP2016031419A (ja) 2014-07-28 2016-03-07 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
US20160077318A1 (en) 2013-06-21 2016-03-17 Olympus Corporation Zoom Lens and Image Pickup Apparatus Using the Same
JP2016048354A (ja) 2014-08-28 2016-04-07 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
JP2016075742A (ja) 2014-10-03 2016-05-12 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
US20160209632A1 (en) * 2015-01-21 2016-07-21 Panasonic Intellectual Property Management Co., Ltd. Zoom lens system, interchangeable lens device, and camera system
CN106249391A (zh) 2015-06-05 2016-12-21 佳能株式会社 变焦透镜和包括变焦透镜的图像拾取装置
US20170010437A1 (en) 2013-12-18 2017-01-12 Fujifilm Corporation Imaging lens and imaging apparatus
US20170108679A1 (en) 2015-10-14 2017-04-20 Canon Kabushiki Kaisha Optical system and image pickup apparatus including the same
WO2017094662A1 (ja) 2015-11-30 2017-06-08 株式会社ニコン 変倍光学系、光学機器および変倍光学系の製造方法
WO2017094663A1 (ja) 2015-11-30 2017-06-08 株式会社ニコン 変倍光学系、光学機器および変倍光学系の製造方法
US20170176729A1 (en) 2012-12-28 2017-06-22 Takashi Kubota Projection zoom lens
US20170199356A1 (en) 2016-01-08 2017-07-13 Canon Kabushiki Kaisha Optical system and image pickup apparatus including the same
US20170276917A1 (en) 2016-03-25 2017-09-28 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus including the same
WO2018139160A1 (ja) 2017-01-25 2018-08-02 ソニー株式会社 ズームレンズおよび撮像装置
US20180284406A1 (en) 2017-03-31 2018-10-04 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus including the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8472125B2 (en) 2007-11-15 2013-06-25 Konica Minolta Opto, Inc. Variable power optical system, imaging device, and digital device
JP2010128032A (ja) 2008-11-26 2010-06-10 Olympus Imaging Corp ズームレンズ及びこのズームレンズを備えた撮像装置
JP5508812B2 (ja) 2009-10-29 2014-06-04 オリンパス株式会社 電子撮像装置

Patent Citations (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5576891A (en) 1993-04-22 1996-11-19 Ricoh Company, Ltd. Zoom lens using a first lens group having a positive focal length and a second lens group having a negative focal length
JPH11109233A (ja) 1997-09-30 1999-04-23 Minolta Co Ltd ズームレンズ系
US6118592A (en) 1997-09-30 2000-09-12 Minolta Co., Ltd. Zoom lens system
CN1517742A (zh) 2003-01-24 2004-08-04 株式会社尼康 变焦透镜系统
US20050122596A1 (en) 2003-11-14 2005-06-09 Kazuyasu Ohashi Zoom lens, lens unit, camera and portable information terminal device
CN1755412A (zh) 2004-09-27 2006-04-05 富士能株式会社 变焦距光学系统
CN100381855C (zh) 2004-09-27 2008-04-16 富士能株式会社 变焦距光学系统
JP2006337648A (ja) 2005-06-01 2006-12-14 Canon Inc ズームレンズ
JP2007148056A (ja) 2005-11-29 2007-06-14 Canon Inc ズーム光学系
CN101487925A (zh) 2008-01-16 2009-07-22 佳能株式会社 变焦透镜和包括该变焦透镜的图像拾取设备
JP2010039426A (ja) 2008-08-08 2010-02-18 Hoya Corp 高変倍ズームレンズ系
US7813051B2 (en) 2008-08-08 2010-10-12 Hoya Corporation High zoom-ratio zoom lens system
CN101770067A (zh) 2008-12-26 2010-07-07 佳能株式会社 光学系统和包含光学系统的光学装置
JP2011059293A (ja) 2009-09-09 2011-03-24 Sigma Corp 変倍結像光学系
US20110090574A1 (en) 2009-09-09 2011-04-21 Nikon Corporation Wide-angle lens, imaging optical apparatus and digital equipment
JP2012150248A (ja) 2011-01-19 2012-08-09 Nikon Corp 変倍光学系、光学機器、及び、変倍光学系の製造方法
JP2012212087A (ja) 2011-03-31 2012-11-01 Nikon Corp ズームレンズ、光学装置、ズームレンズの製造方法
CN103529541A (zh) 2012-06-29 2014-01-22 佳能株式会社 变焦透镜和图像拾取装置
US20140055659A1 (en) 2012-08-22 2014-02-27 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus
US20140085513A1 (en) * 2012-09-21 2014-03-27 Canon Kabushiki Kaisha Zoom lens, image-pickup apparatus having the same, and image projection apparatus having the same
US20140125858A1 (en) 2012-11-06 2014-05-08 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus including same
US20170176729A1 (en) 2012-12-28 2017-06-22 Takashi Kubota Projection zoom lens
US9217851B2 (en) 2013-04-15 2015-12-22 Canon Kabushiki Kaisha Zoom lens and image pickup device including the same
US20140307152A1 (en) 2013-04-15 2014-10-16 Canon Kabushiki Kaisha Zoom lens and image pickup device including the same
US20160077318A1 (en) 2013-06-21 2016-03-17 Olympus Corporation Zoom Lens and Image Pickup Apparatus Using the Same
JP2015028530A (ja) 2013-07-30 2015-02-12 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
US20150077594A1 (en) 2013-08-05 2015-03-19 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus including the same
US20170010437A1 (en) 2013-12-18 2017-01-12 Fujifilm Corporation Imaging lens and imaging apparatus
JP2015138122A (ja) 2014-01-22 2015-07-30 キヤノン株式会社 光学系及びそれを有する撮像装置
EP2955558A1 (en) 2014-06-13 2015-12-16 Ricoh Company, Ltd. Optical objective of the retrofocus type
JP2016031419A (ja) 2014-07-28 2016-03-07 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
JP2016048354A (ja) 2014-08-28 2016-04-07 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
JP2016075742A (ja) 2014-10-03 2016-05-12 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
US20160209632A1 (en) * 2015-01-21 2016-07-21 Panasonic Intellectual Property Management Co., Ltd. Zoom lens system, interchangeable lens device, and camera system
CN106249391A (zh) 2015-06-05 2016-12-21 佳能株式会社 变焦透镜和包括变焦透镜的图像拾取装置
US20170108679A1 (en) 2015-10-14 2017-04-20 Canon Kabushiki Kaisha Optical system and image pickup apparatus including the same
WO2017094662A1 (ja) 2015-11-30 2017-06-08 株式会社ニコン 変倍光学系、光学機器および変倍光学系の製造方法
WO2017094663A1 (ja) 2015-11-30 2017-06-08 株式会社ニコン 変倍光学系、光学機器および変倍光学系の製造方法
US20180356618A1 (en) * 2015-11-30 2018-12-13 Nikon Corporation Zoom optical system, optical apparatus and method for manufacturing the zoom optical system
US20170199356A1 (en) 2016-01-08 2017-07-13 Canon Kabushiki Kaisha Optical system and image pickup apparatus including the same
US20170276917A1 (en) 2016-03-25 2017-09-28 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus including the same
WO2018139160A1 (ja) 2017-01-25 2018-08-02 ソニー株式会社 ズームレンズおよび撮像装置
US20180284406A1 (en) 2017-03-31 2018-10-04 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus including the same

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Chinese Office Action dated Oct. 9, 2020, for Corresponding Chinese Application No. 201810657093.3.
Notice of Reasons for Refusal issued by the Japan Patent Office dated Mar. 9, 2021 in corresponding JP Patent Application No. 2017-126009, with English translation.
Notification of the Second Office Action issued by the China National Intellectual Property Administration dated May 28, 2021 in corresponding CN Patent Application No. 201810657093.3, with English translation.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12366726B2 (en) 2021-07-06 2025-07-22 Canon Kabushiki Kaisha Optical system and image pickup apparatus having the same
US12405456B2 (en) 2022-08-10 2025-09-02 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus

Also Published As

Publication number Publication date
CN109143557B (zh) 2021-11-19
CN109143557A (zh) 2019-01-04
JP2019008235A (ja) 2019-01-17
US20190004277A1 (en) 2019-01-03
JP7023625B2 (ja) 2022-02-22

Similar Documents

Publication Publication Date Title
US10627610B2 (en) Zoom lens and image pickup apparatus
US11131829B2 (en) Zoom lens and image pickup apparatus
US9684155B2 (en) Optical system and image pickup apparatus including the same
US8908283B2 (en) Optical system, imaging apparatus, and method for forming image by the optical system
US10545320B2 (en) Zoom lens and image pickup apparatus including the same
US7961409B2 (en) Zoom lens system, optical apparatus, and method for zooming
US10120170B2 (en) Zoom lens and image pickup apparatus including the same
US10754169B2 (en) Optical system and image pickup apparatus including the same
US7924511B2 (en) Optical system, method for focusing, and imaging apparatus equipped therewith
US8144403B2 (en) Zoom lens system, optical apparatus, and method for zooming
US7599123B2 (en) Zoom lens system, imaging apparatus and method for varying focal length
JP4976867B2 (ja) ズームレンズ及びそれを有する撮像装置
JP5465000B2 (ja) ズームレンズ及びそれを有する撮像装置
US10663703B2 (en) Zoom lens and image pickup apparatus
JP6566991B2 (ja) ズームレンズおよびそれを有する撮像装置
US20130107089A1 (en) Zoom lens and image pick-up apparatus having the same
JP5774055B2 (ja) ズームレンズ及びそれを有する撮像装置
US9995918B2 (en) Zoom lens and image pickup apparatus including the same
JP6460711B2 (ja) ズームレンズ及びそれを有する撮像装置
US10495861B2 (en) Zoom lens and image pickup apparatus
US10197780B2 (en) Zoom lens and image pickup apparatus including the same
US8503101B2 (en) Zoom lens and image pickup apparatus equipped with zoom lens
US20090034100A1 (en) Optical system, imaging apparatus, and method for forming image by the optical system
JP2017116702A (ja) ズームレンズ及びそれを有する撮像装置
US11314065B2 (en) Zoom lens and image pickup apparatus

Legal Events

Date Code Title Description
FEPP Fee payment procedure

Free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

AS Assignment

Owner name: CANON KABUSHIKI KAISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IWAMOTO, SHUNJI;REEL/FRAME:047033/0578

Effective date: 20180612

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: ADVISORY ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS

STPP Information on status: patent application and granting procedure in general

Free format text: PUBLICATIONS -- ISSUE FEE PAYMENT RECEIVED

STPP Information on status: patent application and granting procedure in general

Free format text: WITHDRAW FROM ISSUE AWAITING ACTION

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER

STPP Information on status: patent application and granting procedure in general

Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS

STPP Information on status: patent application and granting procedure in general

Free format text: AWAITING TC RESP., ISSUE FEE NOT PAID

STPP Information on status: patent application and granting procedure in general

Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS

STPP Information on status: patent application and granting procedure in general

Free format text: PUBLICATIONS -- ISSUE FEE PAYMENT VERIFIED

STCF Information on status: patent grant

Free format text: PATENTED CASE

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 4